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| | Muslim American Society |
 | | In a number of centers such as Ruha, al Hirah, Jundishapur, and Harran, Christian and Sabaean doctors, many of whom had run away from Church persecution and found refuge in the buffer states between Persia and Byzantium, had built a viable tradition of medical knowledge. |
 | | Al Idrisi asked for a ball of silver 400 rotols in weight (approximately 400 kilograms) and drew on it the seven continents, their lakes and rivers, cities, routes, mountains and plains, and trade routes, and noted on each the distance, height, or length as measured. |
 | | Al Mansur, the second 'Abbasi caliph, regarded astronomy with such approval as to ask the Persian astronomer Nawbakht to be his constant companion; and when the latter died, to appoint his son in his place, along with Ibrahim al Fazari, his son Muhammad, 'Ali Ibn 'Isa al Astrolabi, and others. |
| www.masnet.org /history.asp?id=1033 |
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